We have a new for-profit website harvesting fanfics from AO3 and posting them without permission:
ebooks-tree.com.
Best to type your authorname into the search field to see if any of your stuff has been uploaded, and don't fall for the credit card scam that might present itself when you try to have it taken down.
Here's a link to the Tumblr post with details:
http://besinaaeo3.tumblr.com